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Please show detailed solution 3. What is the % of Cr in a sample of chrome-iron ore if 0.200 g of the ore after oxidation

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3. What is the % of Cr in a sample of chrome-iron ore if 0.200 g of the ore after oxidation with Na2O2 and treatment of the acidified solution with 5.0 mmol of ferrous sulfate requires 0.166 mmol of dichromate for the X'ss Fe(II)

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